Academic Appointments


  • Professor, Particle Physics and Astrophysics
  • Professor, Physics

2017-18 Courses


Stanford Advisees


All Publications


  • EVIDENCE FOR NONLINEAR GROWTH OF STRUCTURE FROM AN X-RAY-SELECTED CLUSTER SURVEY USING A NOVEL JOINT ANALYSIS OF THE CHANDRA AND XMM-NEWTON ARCHIVES ASTROPHYSICAL JOURNAL Peterson, J. R., Jernigan, J. G., Gupta, R. R., Bankert, J., Kahn, S. M. 2009; 707 (2): 878-889
  • Performance of the EBIT calorimeter spectrometer 17th Topical Conference on High-Temperature Plasma Diagnostics Porter, F. S., Gygax, J., Kelley, R. L., Kilbourne, C. A., King, J. M., Beiersdorfer, P., Brown, G. V., Thorn, D. B., Kahn, S. M. AMER INST PHYSICS. 2008

    Abstract

    The EBIT calorimeter spectrometer (ECS) is a new high-resolution, broadband x-ray spectrometer that has recently been installed at the Electron Beam Ion Trap Facility (EBIT) at the Lawrence Livermore National Laboratory. The ECS is an entirely new production class spectrometer that replaces the XRS/EBIT spectrometer that has been operating at EBIT since 2000. The ECS utilizes a 32-pixel x-ray calorimeter array from the XRS instrument on the Suzaku x-ray observatory. Eighteen of the pixels are optimized for the 0.1-10 keV band and yield 4.5 eV full width at half maximum energy resolution and 95% quantum efficiency at 6 keV. In addition, the ECS includes 14 detector pixels that are optimized for the high-energy band with a bandpass from 0.5 to over 100 keV with 34 eV resolution and 32% quantum efficiency at 60 keV. The ECS detector array is operated at 50 mK using a five stage cryogenic system that is entirely automated. The instrument takes data continuously for over 65 h with a 2.5 h recycle time. The ECS is a nondispersive, broadband, highly efficient spectrometer that is one of the prime instruments at the EBIT facility. The instrument is used for studies of absolute cross sections, charge exchange recombination, and x-ray emission from nonequilibrium plasmas, among other measurements in our laboratory astrophysics program.

    View details for DOI 10.1063/1.2957925

    View details for Web of Science ID 000260573500065

    View details for PubMedID 19044469

  • First-year spectroscopy for the Sloan Digital Sky Survey-II supernova survey ASTRONOMICAL JOURNAL Zheng, C., Romani, R. W., Sako, M., Marriner, J., Bassett, B., Becker, A., Choi, C., Cinabro, D., DeJongh, F., Depoy, D. L., Dilday, B., Doi, M., Frieman, J. A., Garnavich, P. M., Hogan, C. J., Holtzman, J., Im, M., Jha, S., Kessler, R., Konishi, K., Lampeitl, H., Marshall, J. L., McGinnis, D., Miknaitis, G., Nichol, R. C., Prieto, J. L., Riess, A. G., Richmond, M. W., Schneider, D. P., Smith, M., Takanashi, N., Tokita, K., Van Der Heyden, K., Yasuda, N., Assef, R. J., Barentine, J., Bender, R., Blandford, R. D., Bremer, M., Brewington, H., Collins, C. A., Crotts, A., Dembicky, J., Eastman, J., Edge, A., Elson, E., Eyler, M. E., Filippenko, A. V., Foley, R. J., Frank, S., Goobar, A., Harvanek, M., Hopp, U., Ihara, Y., Kahn, S., Ketzeback, W., Kleinman, S. J., Kollatschny, W., Krzesinski, J., Leloudas, G., Long, D. C., Lucey, J., Malanushenko, E., Malanushenko, V., McMillan, R. J., Morgan, C. W., Morokuma, T., Nitta, A., Ostman, L., Pan, K., Romer, A. K., Saurage, G., Schlesinger, K., Snedden, S. A., Sollerman, J., Stritzinger, M., Watson, L. C., Watters, S., Wheeler, J. C., York, D. 2008; 135 (5): 1766-1784
  • The XRS microcalorimeter spectrometer at the Livermore electron beam ion trap 12th International Workshop on Electron Beam Ion Trap Porter, F. S., Beck, B. R., Beiersdorfer, P., Boyce, K. R., Brown, G. V., Chen, H., Gygax, J., Kahn, S. M., Kelley, R. L., Kilbourne, C. A., Magee, E., Thorn, D. B. CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS. 2008: 231–40

    View details for DOI 10.1139/P07-147

    View details for Web of Science ID 000253774700022

  • The LSST Camera Overview: Design and Performance Conference on Ground-Based and Airborne Instrumentation for Astronomy II Gilmore, K., Kahn, S., Nordby, M., O'Connor, P., Oliver, J., Radeka, V., Schalk, T., Schindler, R., Van Berg, R. SPIE-INT SOC OPTICAL ENGINEERING. 2008

    View details for DOI 10.1117/12.789947

    View details for Web of Science ID 000259917700012

  • Laboratory astrophysics in the extreme ultraviolet 12th International Workshop on Electron Beam Ion Trap Lepson, J. K., Beiersdorfer, P., Bitter, M., Kahn, S. M. CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS. 2008: 175–82

    View details for DOI 10.1139/P07-167

    View details for Web of Science ID 000253774700015

  • The Sloan Digital Sky Survey-II Supernova Survey: Technical summary ASTRONOMICAL JOURNAL Frieman, J. A., Bassett, B., Becker, A., Choi, C., Cinabro, D., DeJongh, F., Depoy, D. L., Dilday, B., Doi, M., Garnavich, P. M., Hogan, C. J., Holtzman, J., Im, M., Jha, S., Kessler, R., Konishi, K., Lampeitl, H., Marriner, J., Marshall, J. L., McGinnis, D., Miknaitis, G., Nichol, R. C., Prieto, J. L., Riess, A. G., Richmond, M. W., Romani, R., Sako, M., Schneider, D. P., Smith, M., Takanashi, N., Tokita, K., Van Der Heyden, K., Yasuda, N., Zheng, C., Adelman-McCarthy, J., Annis, J., Assef, R. J., Barentine, J., Bender, R., Blandford, R. D., Boroski, W. N., Bremer, M., Brewington, H., Collins, C. A., Crotts, A., Dembicky, J., Eastman, J., Edge, A., Edmondson, E., Elson, E., Eyler, M. E., Filippenko, A. V., Foley, R. J., Frank, S., Goobar, A., Gueth, T., Gunn, J. E., Harvanek, M., Hopp, U., Ihara, Y., Ivezic, Z., Kahn, S., Kaplan, J., Kent, S., Ketzeback, W., Kleman, S. J., Kollatschny, W., Kron, R. G., Krzesinski, J., Lamenti, D., Leloudas, G., Lin, H., Long, D. C., Lucey, J., Lupton, R. H., Malanushenko, E., Malanushenko, V., McMillan, R. J., Mendez, J., Morgan, C. W., Morokuma, T., Nitta, A., Ostman, L., Pan, K., Rockosi, C. M., Romer, A. K., Ruiz-Lapuente, P., Saurage, G., Schlesinger, K., Snedden, S. A., Sollerman, J., Stoughton, C., Stritzinger, M., SubbaRao, M., Tucker, D., Vaisanen, P., Watson, L. C., Watters, S., Wheeler, J. C., Yanny, B., York, D. 2008; 135 (1): 338-347
  • Laboratory measurements of 3 -> 2 X-ray line ratios of F-like Fe XVIII and Ni XX ASTROPHYSICAL JOURNAL Gu, M. F., Chen, H., Brown, G. V., Beiersdorfer, P., Kahn, S. M. 2007; 670 (2): 1504-1509
  • Evidence for the importance of resonance scattering in X-ray emission line profiles of the O star xi Puppis ASTROPHYSICAL JOURNAL Leutenegger, M. A., Owocki, S. P., Kahn, S. M., Paerels, F. B. 2007; 659 (1): 642-649
  • Wavelength measurements of Ni L-shell lines between 9 and 15 angstrom ASTROPHYSICAL JOURNAL Gu, M. F., Beiersdorfer, P., Brown, G. V., Chen, H., Thorn, D. B., Kahn, S. M. 2007; 657 (2): 1172-1177
  • On the putative detection of z > 0 X-ray absorption features in the spectrum of Mrk 421 ASTROPHYSICAL JOURNAL Rasmussen, A. P., Kahn, S. M., Paerels, F., Willem den Herder, J., Kaastra, J., de Vries, C. 2007; 656 (1): 129-138
  • Laboratory measurements of high-n iron L-shell X-ray lines ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES Chen, H., Gu, M. F., Behar, E., Brown, G. V., Kahn, S. M., Beiersdorfer, P. 2007; 168 (2): 319-336
  • First use of a HyViSI H4RG for astronomical observations Conference on Focal Plane Arrays for Space Telescopes III Simms, L. M., Figer, D. F., Hanold, B. J., Kerr, D. J., Gilmore, D. K., Kahn, S. M., Tyson, J. A. SPIE-INT SOC OPTICAL ENGINEERING. 2007

    View details for DOI 10.1117/12.740088

    View details for Web of Science ID 000251052300014

  • X-ray spectral study of the photoionized stellar wind in Vela X-1 ASTROPHYSICAL JOURNAL Watanabe, S., Sako, M., Ishida, M., Ishisaki, Y., Kahn, S. M., Kohmura, T., Nagase, F., Paerels, F., Takahashi, T. 2006; 651 (1): 421-437
  • Measurements and analysis of helium-like triplet ratios in the X-ray spectra of O-type stars ASTROPHYSICAL JOURNAL Leutenegger, M. A., Paerels, F. B., Kahn, S. M., Cohen, D. H. 2006; 650 (2): 1096-1110
  • Capella corona revisited: A combined view from XMM-Newton RGS and Chandra HETGS and LETGS ASTROPHYSICAL JOURNAL Gu, M. F., Gupta, R., Peterson, J. R., Sako, M., Kahn, S. M. 2006; 649 (2): 979-991
  • Electron impact excitation cross section measurement for n=3 to n=2 line emission in Fe17+ to Fe23+ ASTROPHYSICAL JOURNAL Chen, H., Gu, M. F., Beiersdorfer, P., Boyce, K. R., Brown, G. V., Kahn, S. M., Kelley, R. L., Kilbourne, C. A., Porter, F. S., Scofield, J. H. 2006; 646 (1): 653-665
  • Energy-dependent excitation cross section measurements of the diagnostic lines of Fe XVII PHYSICAL REVIEW LETTERS Brown, G. V., Beiersdorfer, P., Chen, H., Scofield, J. H., Boyce, K. R., Kelley, R. L., Kilbourne, C. A., Porter, F. S., Gu, M. F., Kahn, S. M., Szymkowiak, A. E. 2006; 96 (25)

    Abstract

    By implementing a large-area, gain-stabilized microcalorimeter array on an electron beam ion trap, the electron-impact excitation cross sections for the dominant x-ray lines in the Fe XVII spectrum have been measured as a function of electron energy establishing a benchmark for atomic calculations. The results show that the calculations consistently predict the cross section of the resonance line to be significantly larger than measured. The lower cross section accounts for several problems found when modeling solar and astrophysical Fe XVII spectra.

    View details for DOI 10.1103/PhysRevLett.96.253201

    View details for Web of Science ID 000238697000015

    View details for PubMedID 16907303

  • Inner-shell absorption lines of FeVI-Fe XVI: A many-body perturbation theory approach ASTROPHYSICAL JOURNAL Gu, M. F., Holczer, T., Behar, E., Kahn, S. M. 2006; 641 (2): 1227-1232
  • Phonon-mediated distributed transition-edge-sensor X-ray detectors for surveys of galaxy clusters and the warm-hot interstellar medium 11th International Workshop on Low-Temperature Detectors Leman, S. W., Brink, P. L., Cabrera, B., Castle, J. P., Chakraborty, S., Deiker, S., Kahn, S., Martinez-Galarce, D. S., Stern, R. A., Tomada, A. ELSEVIER SCIENCE BV. 2006: 488–90
  • The LSST camera overview Conference on Ground-Based and Airborne Instrumentation for Astronomy Gilmore, K., Kahn, S., Nordby, M., Burke, D., O'Connor, P., Oliver, J., Radeka, V., Schalk, T., Schindler, R. SPIE-INT SOC OPTICAL ENGINEERING. 2006

    View details for DOI 10.1117/12.673236

    View details for Web of Science ID 000240348500012

  • Laboratory measurement and theoretical modeling of K-shell X-ray lines from inner-shell excited and ionized ions of oxygen ASTROPHYSICAL JOURNAL Gu, M. F., Schmidt, M., Beiersdorfer, P., Chen, H., Thorn, D. B., Trabert, E., Behar, E., Kahn, S. M. 2005; 627 (2): 1066-1071
  • Laboratory simulation of cometary X-rays using a high-resolution microcalorimeter 12th International Conference on the Physics of Highly Charged Ions Beiersdorfer, P., Chen, H., Boyce, K. R., Brown, G. V., Kelley, R. L., Kilbourne, C. A., Porter, F. S., Kahn, S. M. ELSEVIER SCIENCE BV. 2005: 116–119
  • Comparisons of laboratory wavelength measurements with theoretical calculations for neon-like through lithium-like argon, sulfur and silicon 12th International Conference on the Physics of Highly Charged Ions Lepson, J. K., Beiersdorfer, P., Behar, E., Kahn, S. M. ELSEVIER SCIENCE BV. 2005: 131–134
  • Emission-line spectra of SVII-S XIV in the 20-75 A wavelength region ASTROPHYSICAL JOURNAL Lepson, J. K., Beiersdorfer, P., Behar, E., Kahn, S. M. 2005; 625 (2): 1045-1061
  • XMM-Newton observations of the heavily absorbed Seyfert 1 galaxy IC 4329A ASTRONOMY & ASTROPHYSICS Steenbrugge, K. C., Kaastra, J. S., Sako, M., Branduardi-Raymont, G., Behar, E., Paerels, F. B., Blustin, A. J., Kahn, S. M. 2005; 432 (2): 453-462
  • Excitation cross section measurement for n=3 to n=2 line emission in Fe20+ to Fe23+ ASTROPHYSICAL JOURNAL Chen, H., Beiersdorfer, P., Scofield, J. H., Brown, G. V., Boyce, K. R., Kelley, R. L., Kilbourne, C. A., Porter, F. S., Gu, M. F., Kahn, S. M. 2005; 618 (2): 1086-1094
  • New results in laboratory X-ray astrophysics 25th General Assembly of the International-Astronomical-Union Beiersdorfer, P., Chen, H., Boyce, K. R., Brown, G. V., Kelley, R. L., Porter, F. S., Stahle, C. K., Lepson, J. K., Jernigan, J. G., Wargelin, B. J., Kahn, S. M. ASTRONOMICAL SOC PACIFIC. 2005: 633–639
  • Multivariate Monte Carlo methods for the reflection grating spectrometers on XMM-Newton ASTROPHYSICAL JOURNAL Peterson, J. R., Jernigan, J. G., Kahn, S. M. 2004; 615 (1): 545-554
  • The Astro-E2 X-ray spectrometer/EBIT microcalorimeter x-ray spectrometer 15th Topical Conference on High-Temperature Plasma Diagnostics Porter, F. S., Brown, G. V., Boyce, K. R., Kelley, R. L., Kilbourne, C. A., Beiersdorfer, P., Chen, H., Terracol, S., Kahn, S. M., Szymkowiak, A. E. AMER INST PHYSICS. 2004: 3772–74

    View details for DOI 10.1063/1.1781758

    View details for Web of Science ID 000224755900118

  • Detection of a fully resolved Compton shoulder of the iron K alpha line in the Chandra X-ray spectrum of GX 301-2 ASTROPHYSICAL JOURNAL Watanabe, S., Sako, M., Ishida, M., Ishisaki, Y., Kahn, S. M., KOHMURA, T., Morita, U., Nagase, F., Paerels, F., Takahashi, T. 2003; 597 (1): L37-L40